But Mr Davies said his election literature was “simply true” and in the council election voters had switched from the Liberal Democrats to Labour.

Mr Black said: “In the leaflet Geraint claims that the Liberal Democrats are backing him, using as his evidence the testimony of two people living in Mayals who have no connection with the party whatsoever, who are not members of the Liberal Democrats.

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“I am absolutely astonished, it’s misleading. The headline implies we are not standing and we are supporting Geraint Davies but we have a very good candidate [Michael O’Carroll] standing against him.”

He added: “The Liberal Democrats are standing against Geraint Davies and are not supporting him in any way whatsoever.”

He also suggested there was no mention of Labour leader Jeremy Corbyn in the literature being sent to voters.

He said: “He’s not only distancing himself from the leader but also his party policy.”

But Mr Davies hit back and said a number of Lib Dem voters were looking to vote Labour on June 8.

He said: “My ‘Re-elect Geraint Davies as Swansea West MP’ leaflet states the facts that former Liberal Democrat voters are backing me.

“The statement that ‘Lib Dems know only Geraint Davies can win the fight for free trade with the EU, environmental protection and rights at work. He’s the best choice in Swansea for Lib Dem Remain voters’ is simply true and lots of voters of all parties are pointing it out.

“The May council election saw a big swing from Lib Dem to Labour and our canvass returns underline that people increasingly understand voting Lib Dem if you are against the Tories is a wasted vote.

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“I’m fighting to ensure the 25,000 jobs in Swansea Bay in exports to the EU are protected in our Brexit negotiation as they are at risk from a large Tory majority in Westminster being given enough MPs to turn their backs on the European market.

“The Lib Dems can’t win in Swansea West as it is now a two horse race, so a Lib Dem vote is simply a vote for the Tories - as are votes for the Greens and Plaid Cymru.”

He added: It’s disingenuous for Lib Dem Peter Black to suggest otherwise and his remarks show he cares more about maintaining a small number of ineffective Lib Dem votes than protecting thousands of Swansea jobs from tariffs. There’s only one way to protect these jobs in Swansea West and that’s to vote Welsh Labour.”